// Copied from the Public Domain C Library (PDCLib). r519
#include <cstring>

namespace std
{

    int memcmp( const void * s1, const void * s2, size_t n )
    {
        const unsigned char * p1 = (const unsigned char *) s1;
        const unsigned char * p2 = (const unsigned char *) s2;
        while ( n-- )
        {
            if ( *p1 != *p2 )
            {
                return *p1 - *p2;
            }
            ++p1;
            ++p2;
        }
        return 0;
    }

} //namespace std
